Flattened boomerang



FIG. 1 is a top plan of our new design for a flattened boomerang;

FIG. 2 is a top, front and right side perspective view of our new design;

FIG. 3 is a right side elevation view thereof; and,

FIG. 4 is a left side elevation view thereof. 

We claim the ornamental design for a flattened boomerang, as shown and described. 